How do you evaluate #cos 892° #?

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Answer 1 · 2016-05-29T06:33:05

#- cos 8^o=-0.9903#, nearly.

Use cos (odd multiple of 180-a)#=-cos a#. Here this angle is in the

second quadrant.

#cos 892^o#

#=cos (900-8)^o#

#= cos (5X180-8)^o#

#=-cos 8^o=-0.9903,#

nearly.